4 Key macropad PCBMade a larger version of the 2 Pack. The design is the same, just wider. The LEDs are now in a 2x2 matrix, which requires only 2 resistors. This is run by an Arduino sketch with an interrupt driven LED scan. This allows for multiple levels of brightness and reactive lighting.
The combined board is a perfect 77.4mm square. It is small enough for the $2 for 10 special at EasyEDA.com.
- 1.6mm PCB top plate/PCB/bottom in one
- M2 spacers and screws
- Pro Micro controller
- Switch top removable cut outs